Overvoltage protected fluorescent tube supply circuit

Details Overvoltage protected fluorescent tube supply circuit Overvoltage protected fluorescent tube supply circuit

1978-01-27

1979-07-17

Chatmon, Jr., Saxfield

Electric lamp and discharge devices: systems

Automatic substitution of the power supply

315DIG5, 315175, 315222, 307 66, 361112, H05B 3700, H05B 4114

Patent

active

041616740

ABSTRACT:
To prevent excessive voltages from interfering with a switching transistor supplying a fluorescent tube circuit with alternating pulses from a d-c supply upon removal of the fluorescent tube from the tube transformer, a voltage detector is connected to the primary or input winding of the fluorescent tube transformer to determine occurrence of excessive voltages upon removal of the tube from the secondary, the sensed excessive voltage being applied to a switching circuit to remove the transformer from the supply. The system is particularly applicable to emergency supply connections in which the tubes are, normally, supplied from an alternating current network and from a transistor inverter and a battery under conditions of network power failures.

REFERENCES:
patent: 3351770 (1967-11-01), O'Sullivan et al.
patent: 3754160 (1973-08-01), Jensen
patent: 3869639 (1975-03-01), Herzog
patent: 3889153 (1975-06-01), Pierce
patent: 3906243 (1975-09-01), Herzog
patent: 4005335 (1977-01-01), Perper
patent: 4029993 (1977-06-01), Alley et al.

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